Fundamental mechanics of aortic heart valve closure

Hose, D.R.; Narracott, Andrew; Penrose, Justin; Baguley, David; Jones, I.P.; Lawford, Patricia

doi:10.1016/j.jbiomech.2005.01.029

Cited by 22 publications

(17 citation statements)

References 5 publications

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“…Mesh smoothing is applied to propagate the boundary displacements throughout the mesh volume. Previous approaches to the coupling of the rigid-body motion and the CFD solution have required several 'coupling loops' to be undertaken at each time step to ensure convergence between the fluid solution and the rigid-body motion of the leaflet [23]. The current study uses a modified approach where Equations (1) and (2) are included as a function within the ANSYS-CFX solver file.…”

Section: Numerical Implementation Within Ansys-cfxmentioning

confidence: 99%

“…These sensitivity tests are undertaken during the early phase of the valve motion, before remeshing of the fluid volume is required. When considering the valve in the current configuration, the ventricular pressure continually increases between the start of the analysis and valve closure in contrast to the aortic position [23], where the valve closes during a deceleration phase. Manual remeshing of the fluid domain to obtain results through to valve closure is reported elsewhere [25,26].…”

Section: Numerical Implementation Within Ansys-cfxmentioning

confidence: 99%

“…This method has been applied to a 2-D model of a flexible valve [22]. Hose previously described the application of ANSYS-CFX to the study of closure forces on an aortic valve prosthesis [23].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analysis of a mechanical heart valve prosthesis and a native venous valve: Two distinct applications of FSI to biomedical applications

Narracott

Zervides

Díaz

et al. 2009

Numer Methods Biomed Eng

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SUMMARYThis paper reports the application of two commercial codes to the study of distinct cardiovascular problems: dynamics of a mechanical heart valve prosthesis and function of a native venous valve. The choice of code is driven by the characteristics of the problem. The ANSYS-CFX implicit finite volume code is employed for the mechanical valve where the solution is dominated by the interaction between the local fluid domain and the rigid valve leaflets. The LS-DYNA explicit dynamics code is used due to the stability of this approach when applied to systems with very flexible structural components such as the leaflets of a venous valve. The mechanical valve dynamics remain consistent for a range of mesh densities and residual criteria but begin to vary once the solution time step is increased above 2E-4 s. Venous valve function after application of a gravitational body load is shown to be dependent on parent vessel elastic modulus, E. The venous valve initially closes to a greater extent with a 'softer' parent vessel. Both approaches show promise for further study of these biomedical systems including the cavitation and thrombotic potential of mechanical valves and the local residence of blood constituents in the region of venous valve sinuses.

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Section: Numerical Implementation Within Ansys-cfxmentioning

confidence: 99%

Section: Numerical Implementation Within Ansys-cfxmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of a mechanical heart valve prosthesis and a native venous valve: Two distinct applications of FSI to biomedical applications

Narracott

Zervides

Díaz

et al. 2009

Numer Methods Biomed Eng

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show abstract

“…Hence, most of the structural analyses for the stress measure in the valve leaflet have been performed through the numerical method, i.e., finite element method (FEM). Structural failures of biological and mechanical heart valves have been shown to occur as a consequence of high stresses in the leaflets during opening and closing [4][5][6][7][8][9][10][11][12]. These structural analysis studies for the stress reduction in the valve leaflet are important and very required for the design of the biological and mechanical heart valves.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis for the structural strength comparison of St. Jude Medical and Edwards MIRA bileaflet mechanical heart valve prostheses

Kwon

2010

J Mech Sci Technol

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This paper presents a numerical analysis for the structural strength comparison of the St. Jude Medical bileaflet mechanical heart valve prosthesis with flat leaflet and the Edwards MIRA bileaflet mechanical heart valve prosthesis with curved leaflet. Computer aided engineering systems are used in the analysis. The blood fluid pressure is applied to both flat and curved leaflets of the bileaflet mechanical heart valve prostheses for the rigid body dynamic analysis to confirm the almost same dynamic characteristics of both flat and curved leaflet motions. Thereafter, using the same blood fluid pressure and dynamic characteristics of leaflet motions, structural mechanic analyses for both flat and curved leaflets of the mechanical heart valve prostheses are carried out to show quite different stress and deformation results, respectively. Conclusively, from the viewpoint of stress, it is revealed that the St. Jude Medical bileaflet mechanical heart valve prosthesis is structurally stronger and better than the Edwards MIRA bileaflet mechanical heart valve prosthesis. Computer aided engineering systems used in this comparative structural analysis are ADAMS for the rigid body dynamic analysis, and NISA for the structural mechanic analysis.

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“…Later, an iterative method is used to obtain the solution for each spatial element or volume. The overall goal is to solve the governing equations of the fluid given by the 3-dimensional (3-D) Navier-Stokes equations, by simplifying large complex partial differential equations for the flow physics into algebraic equations (Hose et al, 2006;Onate et al, 2004;Storti et al, 2008). Through this approach, CFD can numerically predict a solution for the nonlinear Navier-Stokes equations which allows the uncovering of the blood flow field surrounding a heart valve (Chandran et al, 2007;Kleinstreuer, 2006).…”

Section: In Heart Valve Studiesmentioning

confidence: 99%

Movement Effects on the Flow Physics and Nutrient Delivery in Engineered Valvular Tissues

Salinas¹

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Fundamental mechanics of aortic heart valve closure

Cited by 22 publications

References 5 publications

Analysis of a mechanical heart valve prosthesis and a native venous valve: Two distinct applications of FSI to biomedical applications

Analysis of a mechanical heart valve prosthesis and a native venous valve: Two distinct applications of FSI to biomedical applications

Numerical analysis for the structural strength comparison of St. Jude Medical and Edwards MIRA bileaflet mechanical heart valve prostheses

Movement Effects on the Flow Physics and Nutrient Delivery in Engineered Valvular Tissues

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